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            <td class="headerCovTableEntry">46</td>
            <td class="headerCovTableEntry">52</td>
            <td class="headerCovTableEntryMed">88.5 %</td>
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            <td class="headerItem">Date:</td>
            <td class="headerValue">2017-10-09</td>
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<pre class="sourceHeading">          Line data    Source code</pre>
<pre class="source">
<a name="1"><span class="lineNum">       1 </span>            : /*</a>
<span class="lineNum">       2 </span>            :  * Package : mqtt_client
<span class="lineNum">       3 </span>            :  * Author : S. Hamblett &lt;steve.hamblett@linux.com&gt;
<span class="lineNum">       4 </span>            :  * Date   : 22/06/2017
<span class="lineNum">       5 </span>            :  * Copyright :  S.Hamblett
<span class="lineNum">       6 </span>            :  */
<span class="lineNum">       7 </span>            : 
<span class="lineNum">       8 </span>            : part of mqtt_client;
<span class="lineNum">       9 </span>            : 
<span class="lineNum">      10 </span>            : /// Connection handler that performs connections and disconnections to the hostname in a synchronous manner.
<span class="lineNum">      11 </span>            : class SynchronousMqttConnectionHandler extends MqttConnectionHandler
<span class="lineNum">      12 </span>            :     with events.EventDetector {
<span class="lineNum">      13 </span>            :   /// Max connection attempts
<span class="lineNum">      14 </span>            :   static const int maxConnectionAttempts = 3;
<span class="lineNum">      15 </span>            : 
<span class="lineNum">      16 </span>            :   /// Synchronously connect to the specific Mqtt Connection.
<span class="lineNum">      17 </span>            :   Future&lt;ConnectionState&gt; internalConnect(String hostname, int port,
<span class="lineNum">      18 </span>            :       MqttConnectMessage connectMessage) async {
<span class="lineNum">      19 </span>            :     int connectionAttempts = 0;
<span class="lineNum">      20 </span><span class="lineCov">          3 :     MqttLogger.log(&quot;SynchronousMqttConnectionHandler::internalConnect entered&quot;);</span>
<span class="lineNum">      21 </span>            :     do {
<span class="lineNum">      22 </span>            :       // Initiate the connection
<span class="lineNum">      23 </span><span class="lineCov">          3 :       MqttLogger.log(</span>
<span class="lineNum">      24 </span><span class="lineCov">          3 :           &quot;SynchronousMqttConnectionHandler::internalConnect - initiating connection try $connectionAttempts&quot;);</span>
<span class="lineNum">      25 </span><span class="lineCov">          3 :       connectionState = ConnectionState.connecting;</span>
<span class="lineNum">      26 </span><span class="lineCov">          3 :       if (useWebSocket) {</span>
<span class="lineNum">      27 </span><span class="lineCov">          1 :         MqttLogger.log(</span>
<span class="lineNum">      28 </span>            :             &quot;SynchronousMqttConnectionHandler::internalConnect - websocket selected&quot;);
<span class="lineNum">      29 </span><span class="lineCov">          2 :         connection = new MqttWsConnection();</span>
<span class="lineNum">      30 </span><span class="lineCov">          2 :       } else if (secure) {</span>
<span class="lineNum">      31 </span><span class="lineCov">          1 :         MqttLogger.log(</span>
<span class="lineNum">      32 </span>            :             &quot;SynchronousMqttConnectionHandler::internalConnect - secure selected&quot;);
<span class="lineNum">      33 </span><span class="lineCov">          1 :         connection =</span>
<span class="lineNum">      34 </span><span class="lineCov">          3 :         new MqttSecureConnection(trustedCertPath, privateKeyFilePath);</span>
<span class="lineNum">      35 </span>            :       } else {
<span class="lineNum">      36 </span><span class="lineCov">          1 :         MqttLogger.log(</span>
<span class="lineNum">      37 </span>            :             &quot;SynchronousMqttConnectionHandler::internalConnect - insecure TCP selected&quot;);
<span class="lineNum">      38 </span><span class="lineCov">          2 :         connection = new MqttNormalConnection();</span>
<span class="lineNum">      39 </span>            :       }
<span class="lineNum">      40 </span><span class="lineCov">          9 :       await connection.connect(hostname, port);</span>
<span class="lineNum">      41 </span><span class="lineCov">          6 :       this.registerForMessage(MqttMessageType.connectAck, _connectAckProcessor);</span>
<span class="lineNum">      42 </span><span class="lineCov">          9 :       this.listen(connection, MessageAvailable, this.messageAvailable);</span>
<span class="lineNum">      43 </span>            :       // Transmit the required connection message to the broker.
<span class="lineNum">      44 </span><span class="lineCov">          3 :       MqttLogger.log(</span>
<span class="lineNum">      45 </span>            :           &quot;SynchronousMqttConnectionHandler::internalConnect sending connect message&quot;);
<span class="lineNum">      46 </span><span class="lineCov">          3 :       sendMessage(connectMessage);</span>
<span class="lineNum">      47 </span><span class="lineCov">          3 :       MqttLogger.log(</span>
<span class="lineNum">      48 </span><span class="lineCov">          6 :           &quot;SynchronousMqttConnectionHandler::internalConnect - pre sleep, state = $connectionState&quot;);</span>
<span class="lineNum">      49 </span>            :       // We're the sync connection handler so we need to wait for the brokers acknowledgement of the connections
<span class="lineNum">      50 </span><span class="lineCov">          6 :       await MqttUtilities.asyncSleep(5);</span>
<span class="lineNum">      51 </span><span class="lineCov">          3 :       MqttLogger.log(</span>
<span class="lineNum">      52 </span><span class="lineCov">          6 :           &quot;SynchronousMqttConnectionHandler::internalConnect - post sleep, state = $connectionState&quot;);</span>
<span class="lineNum">      53 </span><span class="lineCov">          6 :     } while (connectionState != ConnectionState.connected &amp;&amp;</span>
<span class="lineNum">      54 </span><span class="lineNoCov">          0 :         ++connectionAttempts &lt; maxConnectionAttempts);</span>
<span class="lineNum">      55 </span>            :     // If we've failed to handshake with the broker, throw an exception.
<span class="lineNum">      56 </span><span class="lineCov">          6 :     if (connectionState != ConnectionState.connected) {</span>
<span class="lineNum">      57 </span>            :       MqttLogger
<span class="lineNum">      58 </span><span class="lineNoCov">          0 :           .log(&quot;SynchronousMqttConnectionHandler::internalConnect failed&quot;);</span>
<span class="lineNum">      59 </span><span class="lineNoCov">          0 :       throw new NoConnectionException(</span>
<span class="lineNum">      60 </span>            :           &quot;The maximum allowed connection attempts ({$maxConnectionAttempts}) were exceeded. &quot;
<span class="lineNum">      61 </span>            :               &quot;The broker is not responding to the connection request message &quot;
<span class="lineNum">      62 </span>            :               &quot;(Missing Connection Acknowledgement&quot;);
<span class="lineNum">      63 </span>            :     }
<span class="lineNum">      64 </span><span class="lineCov">          3 :     MqttLogger.log(</span>
<span class="lineNum">      65 </span><span class="lineCov">          6 :         &quot;SynchronousMqttConnectionHandler::internalConnect exited with state $connectionState&quot;);</span>
<span class="lineNum">      66 </span><span class="lineCov">          3 :     return connectionState;</span>
<span class="lineNum">      67 </span><span class="lineCov">          1 :   }</span>
<span class="lineNum">      68 </span>            : 
<span class="lineNum">      69 </span>            :   ConnectionState disconnect() {
<span class="lineNum">      70 </span><span class="lineCov">          3 :     MqttLogger.log(&quot;SynchronousMqttConnectionHandler::disconnect&quot;);</span>
<span class="lineNum">      71 </span>            :     // Send a disconnect message to the broker
<span class="lineNum">      72 </span><span class="lineCov">          3 :     connectionState = ConnectionState.disconnecting;</span>
<span class="lineNum">      73 </span><span class="lineCov">          6 :     sendMessage(new MqttDisconnectMessage());</span>
<span class="lineNum">      74 </span><span class="lineCov">          3 :     this.ignoreAllEvents();</span>
<span class="lineNum">      75 </span><span class="lineCov">          3 :     _performConnectionDisconnect();</span>
<span class="lineNum">      76 </span><span class="lineCov">          3 :     return connectionState = ConnectionState.disconnected;</span>
<span class="lineNum">      77 </span>            :   }
<span class="lineNum">      78 </span>            : 
<span class="lineNum">      79 </span>            :   /// Disconnects the underlying connection object.
<span class="lineNum">      80 </span>            :   void _performConnectionDisconnect() {
<span class="lineNum">      81 </span>            :     // Set the connection to disconnected.
<span class="lineNum">      82 </span><span class="lineCov">          6 :     connection.disconnectRequested = true;</span>
<span class="lineNum">      83 </span><span class="lineCov">          3 :     connectionState = ConnectionState.disconnected;</span>
<span class="lineNum">      84 </span>            :   }
<span class="lineNum">      85 </span>            : 
<span class="lineNum">      86 </span>            :   /// Processes the connect acknowledgement message.
<span class="lineNum">      87 </span>            :   bool _connectAckProcessor(MqttMessage msg) {
<span class="lineNum">      88 </span><span class="lineCov">          3 :     MqttLogger.log(&quot;SynchronousMqttConnectionHandler::_connectAckProcessor&quot;);</span>
<span class="lineNum">      89 </span>            :     try {
<span class="lineNum">      90 </span><span class="lineCov">          3 :       final MqttConnectAckMessage ackMsg = msg as MqttConnectAckMessage;</span>
<span class="lineNum">      91 </span>            :       // Drop the connection if our connect request has been rejected.
<span class="lineNum">      92 </span><span class="lineCov">          9 :       if (ackMsg.variableHeader.returnCode ==</span>
<span class="lineNum">      93 </span>            :           MqttConnectReturnCode.brokerUnavailable ||
<span class="lineNum">      94 </span><span class="lineCov">          9 :           ackMsg.variableHeader.returnCode ==</span>
<span class="lineNum">      95 </span>            :               MqttConnectReturnCode.identifierRejected ||
<span class="lineNum">      96 </span><span class="lineCov">          9 :           ackMsg.variableHeader.returnCode ==</span>
<span class="lineNum">      97 </span>            :               MqttConnectReturnCode.unacceptedProtocolVersion ||
<span class="lineNum">      98 </span><span class="lineCov">          9 :           ackMsg.variableHeader.returnCode ==</span>
<span class="lineNum">      99 </span>            :               MqttConnectReturnCode.notAuthorized ||
<span class="lineNum">     100 </span><span class="lineCov">          9 :           ackMsg.variableHeader.returnCode ==</span>
<span class="lineNum">     101 </span>            :               MqttConnectReturnCode.badUsernameOrPassword) {
<span class="lineNum">     102 </span><span class="lineNoCov">          0 :         MqttLogger.log(</span>
<span class="lineNum">     103 </span>            :             &quot;SynchronousMqttConnectionHandler::_connectAckProcessor connection rejected&quot;);
<span class="lineNum">     104 </span><span class="lineNoCov">          0 :         _performConnectionDisconnect();</span>
<span class="lineNum">     105 </span>            :       } else {
<span class="lineNum">     106 </span>            :         // Initialize the keepalive to start the ping based keepalive process.
<span class="lineNum">     107 </span><span class="lineCov">          3 :         MqttLogger.log(</span>
<span class="lineNum">     108 </span>            :             &quot;SynchronousMqttConnectionHandler::_connectAckProcessor - state = connected&quot;);
<span class="lineNum">     109 </span><span class="lineCov">          3 :         connectionState = ConnectionState.connected;</span>
<span class="lineNum">     110 </span>            :       }
<span class="lineNum">     111 </span>            :     } catch (InvalidMessageException) {
<span class="lineNum">     112 </span><span class="lineNoCov">          0 :       _performConnectionDisconnect();</span>
<span class="lineNum">     113 </span>            :     }
<span class="lineNum">     114 </span>            :     return true;
<span class="lineNum">     115 </span>            :   }
<span class="lineNum">     116 </span>            : }
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